Augmentation dot on polyphonic notes a second apart

[Steve Dunlop]

I'm running 2.11.38.

In reviewing the output, I see that in situations where the score
contains polyphonic voices, stems in opposing directions, and the upper
voice but not the lower has an augmentation dot, the placement of the
dot in the output is ambiguous.  The source scores I have add horizontal
space between the notes to allow the dot to clearly apply to the upper
voice.  Is this a bug?  Is there a tweak?

Thanks

Steve